<template>
  <div class="sub-filter" v-if="filterData && !filterLoading">
    <div class="item">
      <div class="head">品牌：</div>
      <div class="body">
        <a @click="changeBrand(brand.id)" :class="{active:filterData.selectedBrand===brand.id}" href="javascript:;" v-for="brand in filterData.brands" :key="brand.id">{{brand.name}}</a>
      </div>
    </div>
    <div class="item" v-for="p in filterData.saleProperties" :key="p.id">
      <div class="head">{{p.name}}：</div>
      <div class="body">
        <a @click="changeAttr(p,attr.id)" :class="{active:p.selectedProp===attr.id}" href="javascript:;" v-for="attr in p.properties" :key="attr.id">{{attr.name}}</a>
      </div>
    </div>
  </div>
  <div v-else class="sub-filter">
    <XtxSkeleton class="item" width="800px" height="40px"  />
    <XtxSkeleton class="item" width="800px" height="40px"  />
    <XtxSkeleton class="item" width="600px" height="40px"  />
    <XtxSkeleton class="item" width="600px" height="40px"  />
    <XtxSkeleton class="item" width="600px" height="40px"  />
  </div>
</template>
<script>
import { findSubCategoryFilter } from "@/api/category";
import { useRoute } from "vue-router";
import { ref, watch } from "vue";
export default {
  name: "SubFilter",
  setup(props, {emit}) {
    // 1. 获取数据
    // 2. 数据中需要全部选中，需要预览将来点击激活功能。默认选中全部
    // 3. 完成渲染
    const route = useRoute();
    const filterData = ref(null);
    const filterLoading = ref(false);
    // 4. 分类发生变化的时候需要重新获取筛选数据，需要使用侦听器
    watch(
      () => route.params.id,
      (newVal, oldVal) => {
        // 当你从二级分类去顶级分类也会拿到ID，不能去加载数据因为它不是二级分类的ID
        if (newVal && route.path === "/category/sub/" + newVal) {
          filterLoading.value = true;
        //   console.log(filterLoading);
        // console.log(route.params.id);
          newVal &&
            findSubCategoryFilter(route.params.id).then(( data) => {
              // 品牌全部
            //   console.log(result);
            var result=data.data.result
              result.selectedBrand = null;
              result.brands.unshift({ id: null, name: "全部" });
              // 销售属性全部
              result.saleProperties.forEach((p) => {
                p.selectedProp = undefined;
                p.properties.unshift({ id: null, name: "全部" });
              });
              filterData.value = result;
              filterLoading.value = false;
            //   console.log(filterData.value);
            });
        }
      },
      { immediate: true }
    );
      // 获取筛选参数
    const getFilterParams = () => {
      const filterParams = {}
      const attrs = []
      filterParams.brandId = filterData.value.selectedBrand
      filterData.value.saleProperties.forEach(p => {
        const attr = p.properties.find(attr => attr.id === p.selectedProp)
        if (attr && attr.id !== undefined) {
          attrs.push({ groupName: p.name, propertyName: attr.name })
        }
      })
      if (attrs.length) filterParams.attrs = attrs
      return filterParams
    }

    // 选择品牌
    const changeBrand = (brandId) => {
    
      if (filterData.value.selectedBrand === brandId) return 
      filterData.value.selectedBrand = brandId
      emit('filter-change', getFilterParams())
    }
    // 选中属性
    const changeAttr = (p, attrId) => {
      if (p.selectedProp === attrId) return
      p.selectedProp = attrId
      emit('filter-change', getFilterParams())
    }

    return { filterData, filterLoading, changeBrand, changeAttr }
  }
};
</script>
<style scoped lang='less'>
// 筛选区
.sub-filter {
  background: #fff;
  padding: 25px;
  .item {
    display: flex;
    line-height: 40px;
    .head {
      width: 80px;
      color: #999;
    }
    .body {
      flex: 1;
      a {
        margin-right: 36px;
        transition: all 0.3s;
        display: inline-block;
        &.active,
        &:hover {
          color: @xtxColor;
        }
      }
    }
  }
}
.xtx-skeleton {
  padding: 10px 0;
}
</style>